Eyepiece optical system

Details Eyepiece optical system Eyepiece optical system

1999-09-17

2000-08-15

Epps, Georgia

Optical: systems and elements

Lens

Eyepiece

359643, 359644, G02B 2500

Patent

active

061045438

ABSTRACT:
An eyepiece optical system includes the first lens group constituted by a negative single meniscus lens element having a convex surface on the side of a user's eye, and the second lens group having positive power as a whole, in this order from the object, whereby an intermediate image formed by an objective optical system is positioned between the first lens group and the second lens group. The second lens group includes a positive single meniscus lens element having a convex surface on the side of a user's eye, and a cemented sub-lens group having positive power as a whole. The cemented sub-lens group includes a positive lens element and a negative lens element. Furthermore, the eyepiece optical system satisfies the following conditions:

REFERENCES:
patent: 5353162 (1994-10-01), Ito et al.
patent: 5589976 (1996-12-01), Kanai et al.
patent: 5619379 (1997-04-01), Fukumoto
patent: 5959782 (1999-09-01), Hankawa

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